I bought the 552 SelectTech Dumbbells in October 2006. After spending $$$ on gym memberships in the past 12 years, I am now able to not renew my gym membership when it expires this year. The Bowflex Dumbbells have given me the ability to work out anytime, thus freeing me to do work and play with my kids without sacrificing the intense workouts that I had in the gym. The money I spent on this set will pay me back a thousand times over in terms of money and time saved. Great product, I totally recommend especially for athletes with careers and family with very little time.